URU 435 LPL, Université Rennes 1, 35042 Rennes cedex, France.
UMR CNRS 6164 IETR, Université Rennes 1, 35042 Rennes cedex, France.
Phys Rev Lett. 2014 Feb 7;112(5):053902. doi: 10.1103/PhysRevLett.112.053902. Epub 2014 Feb 5.
We report on the exchange of orbital angular momentum between an electromagnetic wave and a 30 cm diameter ring. Using a turnstile antenna in the GHz range, we induce a torque on a suspended copper strip of the order of 10(-8) N m. Rotations of a few degrees and accelerations up to 4×10(-4) °/s2 are observed. A linear dependence of the acceleration as a function of the applied power is found. There are many applications in the detection of angular momentum in electromagnetics, in acoustics, and also in the magnetization of nanostructures.
我们报告了电磁波与直径为 30 厘米的圆环之间的轨道角动量交换。使用千兆赫兹范围内的转门天线，我们在悬空的铜条上产生了约 10(-8) N·m 的扭矩。观察到几度的旋转和高达 4×10(-4) °/s2 的加速度。发现加速度与所施加功率呈线性关系。在电磁学、声学以及纳米结构的磁化检测等领域都有许多应用。
